A method for acquiring energy and current spectra of nuclear logging tools

Abstract

The invention discloses a method for acquiring the energy current spectrum of a nuclear logging instrument, comprising: acquiring a nuclear signal; simultaneously acquiring the peak current of the nuclear signal and the peak amplitude of the nuclear signal; performing statistical analysis on the amplitude current according to the acquired peak current and peak amplitude ; Perform amplitude energy conversion according to the statistical analysis results of the amplitude current to obtain the energy current spectrum. Compared with the energy spectrum obtained by the conventional processing method, the energy-current spectrum obtained by the method of the present invention can improve the intensity value of the high-energy part of the energy spectrum without changing the shape of the characteristic peak of the energy spectrum, and effectively Improve the information parameter index contained in the energy spectrum; can effectively eliminate the statistical fluctuations in the high-energy part of the energy spectrum; effectively improve the resolution of the characteristic peaks in the high-energy part of the energy spectrum; The relative difference in the intensity value of the low-energy part can effectively reduce the calculation error when using the energy spectrum for parameter analysis.

Description

A method for obtaining energy current spectrum of nuclear logging instrument technical field The invention belongs to the technical field of petroleum logging, be specifically related to a kind of nuclear logging instrument energy current spectrum acquisition method. Background technique [0002] In the field of domestic logging instruments, most downhole nuclear logging instruments need to detect The detector detects radioactive rays, and then acquires the required energy spectrum data through acquisition, processing and analysis, which is used for formation parameters. number for analysis. In the existing nuclear logging instrument, the collected energy spectrum data are all obtained by conventional methods, that is, The energy spectrum obtained by collecting the signal, and then analyzing the energy and count, reflects the energy and count intensity statistical relationship. However, when measuring the radioactivity of the formation, the radiation that the detect...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low counting rate, large statistical fluctuation, and poor resolution of the energy spectrum obtained by nuclear logging tools using conventional processing methods, the present invention proposes a method for obtaining energy and current spectra of nuclear logging tools to solve conventional problems. The energy spectrum has problems such as low count rate, large statistical fluctuation, and poor resolution.

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